Sixty-year old Martha DeClerq cares for her mentally disabled sister, Pauline (Dora van der Groen), in a small town between Brussels and the seaside. Pauline cannot feed herself, tie her shoes, or speak in full sentences; she is stubborn, loving, occasionally mischievous, and particularly devoted to her sister, Paulette (Ann Petersen), who owns a small, tidy shop in town. Cecile (Rosemarie Bergmans), the youngest sister, lives in Brussels with a French intellectual, Albert, and has little contact with her siblings.

When Martha dies, her will stipulates that her estate be split equally between the three sisters, only if Paulette and Cecile care for Pauline themselves. They agree to share Pauline’s care. Although the sisters are fond of Pauline, their relationship with her is awkward and tentative. Initially, Paulette brings Pauline home, and they negotiate the new living arrangements with a mixture of embarrassment and kindness, frustration and delight. When the burden of caring for her sister becomes overwhelming, Pauline is deposited in Brussels at Cecile’s tiny, meticulously kept apartment. When these arrangements become unworkable, Pauline is eventually institutionalized.